BOTHHAND USA
Isolated DC-DC Converters
BUC20W Series -- 20 Watt
Features
Wide 4 : 1 Input Voltage Range(9~36V,18~75V)
High Efficiency up to 90%
Remote On/Off
Input / Output Isolation Voltage: 1.5K Vdc
Extended Operating Temperature Range: -40°C to+85°C
Output Short Circuit Protection:
Hiccup, continuous & Auto Recovery
Over Voltage Protection: Clamp Mode
Shielded Metal Case with Insulated Baseplate
Description
The BUC20W Series are isolated 20W DC/DC converters.
Designed with highly efficiency, allow the operating
Lead Free Design, RoHS Compliant
temperature range of these units to be -40°C to +85°C (with
6 pin DIP Package with Industry-Standard Footprint
derating) in a 6 pin DIP package with industry-standard
Standard 2”X1” Package
footprint. Further features include wide 4 : 1 input voltage
range, remote on/off control, trimmable output, short-circuit
Customer Design Available
protection, over voltage protection and over temperature
protection.
Applications
These converters are well suitable for battery operated
equipment, measurement equipment, telecom, wireless
network, Industry control system, everywhere where isolated,
tightly regulated voltages and compact size are required.
Technical Specification
Model
Number
Input Voltage
Range
All specifications are typical at nominal input, full load and 25°C unless otherwise stated.
Output
Voltage
(Vdc)
Output Current (mA)
Min. Load
(1)
Full. Load
Input Current (mA)
No Load
Full Load
Capacitive
Eff .
(2)
Load, max.
(3)
(%)
(uF)
BUC20-24S0W
BUC20-24S1W
9~36V
BUC20-24S3W Nominal:24VDC
BUC20-24D1W
BUC20-24D2W
BUC20-24D3W
BUC20-48S0W
BUC20-48S1W
18~75V
BUC20-48S3W Nominal:48VDC
BUC20-48D1W
BUC20-48D2W
BUC20-48D3W
BUC20-48S2W
BUC20-24S2W
3.3
5.1
12
15
±5
±12
±15
3.3
5.1
12
15
±5
±12
±15
0
0
150
80
0
25
0
0
0
90
55
0
10
0
5500
4000
1670
1330
±2000
±835
±665
5500
4000
1670
1330
±2000
±835
±665
70
86
38
49
91
45
95
25
38
40
37
39
42
43
945
1012
1006
990
992
1006
1002
461
500
491
489
484
491
495
84
88
87
88
88
87
87
86
89
89
89
90
89
88
33000
18000
3300
2200
8200
1000
900
33000
18000
3300
2200
8200
1000
900
sales@bothhandusa.com
BOTHHAND USA
Isolated DC-DC Converters
BUC20W Series -- 20 Watt
Input Specifications
Input Voltage
24V nominal input
48V nominal input
Input filter
Input surge voltage
(100ms max.)
Input reflected ripple current
Start up time
Remote ON/OFF
Sourcing current of remote control pin
Idle input current (at Remote OFF state)
24V nominal input
48V nominal input
Nominal Vin and full load
Nominal Vin and constant resistive load
Converter: ON
Converter: OFF
Nominal Vin
Nominal Vin
(4)
9-36Vdc
18-75Vdc
Pi Type
50Vdc
100Vdc
100mAp-p typ.
80ms typ.
Open or 3.5V＜Vr＜12V
Short
or 0V＜Vr＜0.7V
＜0.2
mA
＜15
mA
Environmental Specifications
Operating ambient temperature
Maximum case temperature
Storage temperature range
Relative humidity
Temperature coefficient
-40°C to +85°C (with derating)
+100°C
-55°C to +105°C
95% RH max.
±0.02% / °C max.
Output Specifications
Output power
Voltage accuracy
Minimum load
Line regulation
Load Regulation
LL to HL at full load
25% load to full load
Balanced load
Single
Dual
Full load and nominal Vin
20.4 Watts max.
±1%
See table
±0.5%
±0.5%
±0.5%
±3%
85mVp-p max.
3.9V
6.2V
15V
18V
See table
% of full load at nominal input
110% min.
Hiccup, continuous (Auto Recovery)
Unbalanced load 25% to 100% full load
Ripple and Noise
20MHz bandwidth
3.3Vout models
Over voltage protection
(Zener Diode Clamp)
5.1Vout models
12Vout models
15Vout models
Capacitive load
Over load protection
Short circuit protection
Transient response settling time
50% load step change
300µs typ.
(1.8ms for 3.3Vout)
Transient response over shoot
di/dt=0.8A/µs
≤ ±5% of Vo
(≤ ±8% for 3.3Vout)
sales@bothhandusa.com
BOTHHAND USA
Isolated DC-DC Converters
BUC20W Series -- 20 Watt
General Specifications
Efficiency
Isolation voltage
Isolation resistance
Isolation capacitance
Switching frequency
Reliability, calculated MTBF
Nominal input
Input to output
500Vdc
9
See table
1500Vdc
10 Ohms min.
1200pF typ.
300kHz typ.
1.06 × 10 Hrs
Nickel-coated copper
Non-conductive black plastic
Silicon rubber (UL94V-0)
2.0 × 1.0 × 0.4 Inch
(50.8 × 25.4 × 10.2 mm)
32.0g (1.13oz) typ.
6
Physical Specifications
Case material
Base material
Potting material
Dimensions
Weight
BUC20W Series
Power Derating Curve(5)
120
100
Output Power (%)
80
70
60
40
20
0
-40
-20
0
20
40
60
70 80
105
120
Ambient Temp.TA (℃)
℃
BUC20W-48S1
Input voltage vs. Efficiency
Efficiency (%)
Efficiency (%)
BUC20W-48S1
Output Current vs. Efficiency
Input voltage (V)
Output Current (A)
sales@bothhandusa.com
BOTHHAND USA
Isolated DC-DC Converters
BUC20W Series -- 20 Watt
BUC20W-48S1
Transient Response at 50%~100% Max Load
BUC20W-48S1
Loop Gain & Phase at Vi=48V,Full Loa
Note
1. Io below this value will not damage these converters, however, they may not meet all listed specifications.
2. Typical value, tested at nominal input and full load.
3. For each output.
4. Short to -Vin (Pin 2).
5. Based on BUC20-48S1W.
Mechanical Dimensions
Pin Assignment
Single
Dual
+Vin
+Vin
-Vin
-Vin
Remote On/Off
Pin
1
2
3
4
5
6
+Vout
-Vout
Trim
+Vout
Common
-Vout
Unit: mm [inch]
Tolerance:±0.5[0.02]
Specifications subject to change without noticed.
sales@bothhandusa.com
Microchip MCU
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